The Nov. 29, 2017, photo above shows smoke from the Indonesian island of Bali's Mount Agung volcano billowing over the Bali Sea.

(NASA Goddard Space Flight Center)

At a Glance

NASA satellites spotted smoke from the Indonesian island's erupting Mount Agung volcano. The image shows smoke over the Bali Sea. The peak's eruption prompted authorities to tell 100,000 people to evacuate.

An ash cloud billowing from the Indonesian island Bali’s Mount Agung volcano was captured in recently released satellite images from NASA.

The image shows grey clouds of ash over parts of the Bali Sea as the peak continued to erupt on Nov. 29.

Indonesia’s National Disaster Management Authority (BNPB) reported that , according to NASA. On Nov. 27, it raised the alert to a level 4, which is its highest level. The authority has warned that the eruptions are increasing.

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an area extending up to 6 miles in places from the volcano as it belched gray and white plumes, according to a previous report. Ngurah Rai International Airport was shut down on Monday and Tuesday for safety reasons, but flights resumed on Wednesday.

Volcanic ash can have catastrophic consequences if it gets into aircraft engines, and the plume had been blowing toward the airport.

The volcano's last major eruption, in 1963, killed about 1,100 people, but it is unclear how bad the current situation might get or how long it could last. A worst-case scenario would involve an explosive eruption that causes the mountain's cone to collapse.

Students stand on a truck as they head to school with Mount Agung volcano spewing smoke and ash in Karangasem, Bali, Indonesia, Tuesday, Nov. 28, 2017. Mount Agung volcano on Bali has erupted for the first time in more than half a century, forcing closure of the Indonesian tourist island's busy airport as the mountain gushes huge columns of ash that are a threat to airplanes. (AP Photo/Firdia Lisnawati)